Direction of a Neumann BC -- CFD Online Discussion Forums

August 23, 2011, 10:09	Direction of a Neumann BC	#1
fisch Member fisch Join Date: Feb 2010 Posts: 97 Rep Power: 16	Hi, i know that e.g. a Neumann BC for the pressure at a patch is defined as dp/dn where n is the normal to the wall. My question is, in which direction points this normal vector? Always in or out of the domain? Or how is it defined? thanks a lot

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